Synthesis of a Square-Planar Rhodium Alkylidene N-Heterocyclic Carbene Complex and Its Reactivity Toward Alkenes

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• 作者：Laura Palacios ; Xiaowei Miao ; Andrea Di Giuseppe ; Simon Pascal ; Carmen Cunchillos ; Ricardo Castarlenas ; Jes煤s J. P茅rez-Torrente ; Fernando J. Lahoz ; Pierre H. Dixneuf ; Luis A. Oro
• 刊名：Organometallics
• 出版年：2011
• 出版时间：October 10, 2011
• 年：2011
• 卷：30
• 期：19
• 页码：5208-5213
• 全文大小：875K
• 年卷期：v.30,no.19(October 10, 2011)
• ISSN：1520-6041

文摘

The first rhodium alkylidene square-planar complex stabilized by an N-heterocyclic carbene ligand, RhCl(鈺怌HPh)(IPr)PPh₃ (2; IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-carbene), has been prepared by reaction of RhCl(IPr)(PPh₃)₂ (1) with phenyldiazomethane and its dynamic behavior in solution studied. Treatment of 2 with alkenes results in the formation of the 畏²-olefin complexes RhCl(畏²-CH₂鈺怌HR)(IPr)PPh₃ (3, R = H; 4, R = Ph; 5, R = OEt) and new olefins arising from the coupling of the alkylidene with the alkenes, likely via a metallacyclobutane intermediate.